Digitalis lutea subsp. lutea

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 240

(a) Subsp. lutea :

Corolla 15—22(—25) mm; lateral lobes recurved. Racemes secund. 2« = 56. • Throughout the range o f the species except S. Italy and Corse.